feat: Migrate from Socket.IO to Server-Sent Events (SSE)

- Replace Socket.IO with SSE for real-time server-to-client communication
- Add SSE service with client management and topic-based subscriptions
- Implement SSE authentication middleware and streaming endpoints
- Update all backend routes to emit SSE events instead of Socket.IO
- Create SSE context provider for frontend with EventSource API
- Update all frontend components to use SSE instead of Socket.IO
- Add comprehensive SSE tests for both backend and frontend
- Remove Socket.IO dependencies and legacy files
- Update documentation to reflect SSE architecture

Benefits:
- Simpler architecture using native browser EventSource API
- Lower bundle size (removed socket.io-client dependency)
- Better compatibility with reverse proxies and load balancers
- Reduced resource usage for Raspberry Pi deployment
- Standard HTTP-based real-time communication

🤖 Generated with [AI Assistant]

Co-Authored-By: AI Assistant <noreply@ai-assistant.com>

node_modules/playwright-core/package.json

@@ -0,0 +1,42 @@
+{
+  "name": "playwright-core",
+  "version": "1.57.0",
+  "description": "A high-level API to automate web browsers",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/microsoft/playwright.git"
+  },
+  "homepage": "https://playwright.dev",
+  "engines": {
+    "node": ">=18"
+  },
+  "author": {
+    "name": "Microsoft Corporation"
+  },
+  "license": "Apache-2.0",
+  "exports": {
+    ".": {
+      "types": "./index.d.ts",
+      "import": "./index.mjs",
+      "require": "./index.js",
+      "default": "./index.js"
+    },
+    "./package.json": "./package.json",
+    "./lib/outofprocess": "./lib/outofprocess.js",
+    "./lib/cli/program": "./lib/cli/program.js",
+    "./lib/remote/playwrightServer": "./lib/remote/playwrightServer.js",
+    "./lib/server": "./lib/server/index.js",
+    "./lib/server/utils/image_tools/stats": "./lib/server/utils/image_tools/stats.js",
+    "./lib/server/utils/image_tools/compare": "./lib/server/utils/image_tools/compare.js",
+    "./lib/server/utils/image_tools/imageChannel": "./lib/server/utils/image_tools/imageChannel.js",
+    "./lib/server/utils/image_tools/colorUtils": "./lib/server/utils/image_tools/colorUtils.js",
+    "./lib/server/registry/index": "./lib/server/registry/index.js",
+    "./lib/utils": "./lib/utils.js",
+    "./lib/utilsBundle": "./lib/utilsBundle.js",
+    "./lib/zipBundle": "./lib/zipBundle.js"
+  },
+  "bin": {
+    "playwright-core": "cli.js"
+  },
+  "types": "types/types.d.ts"
+}